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I would assume that with CH the atom of H achieves the two electrons it needs to have a full valence shell compared to CN where neither element gets their valence shell full. So because H gets its shell full it would have a stronger bond with C to prevent it's electron being taken compared to CN where there isn't a strong enough bond to keep the electrons since the shell isn't filled up.
N has a half-full shell (p^3) so it has a lower electronegativity than C because adding another electron to N would increase e-e repulsion; therefore, CH has a higher disassociation energy than NH
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